Indoor LD - For indoors with a focus the long distance -

These are intermediate-distance custom-made lenses for indoors which ensure a smooth field of vision indoors in the long distance.

Indoor LD basic design<Back-surface progressive + Back-surface Aspheric Design>

Natural vision with little sensation of swaying or distortion / Expansive, bright, clear field of vision

Indoor LD features

It is possible to make a comparison the field of view in the tab.
  • Field of view of daily use progressive lenses

    Comparison of depths

  • Achiving a wide field of vision with depth at the same time as ensuring a near-distance field of vision

    Comparison of depths

  • A field of vision in which it is possible to see from the view close at hand to the mid distance

    Comparison of depths

  • A field of vision that takes into account maximum ease when using personal computers

    Comparison of depths

  • Field of view of the single vision lens

    Comparison of depths

The photograph is an image that shows differences in fields of vision.
See the content of design below for a more detailed description of the design.

<Non-linear Progressive Power Change (smoothing design)>
for a wide field of vision with depth

The newly-developed "Non-linear Progressive Power Change (smoothing design)" enables expansion of the field of vision around the fitting point(※1).
The Non-linear Progressive Power Change (smoothing design) enables long-distance vision 1.5 times greater than that of the previous indoor lens "Roomiest" and a field of vision at least 10% wider.

Comparison image

<Aspheric Adjustments according to Dioptric Power>
for comfortable vision for any power

Previous lens

Previous lens

With ordinary progressive lenses, a common semi-finished blank(※) is used at each base curve division, resulting in differences in optical performance.

Semi-finished lens material with shaping on one side completed, leaving the other side to be processed when an order is placed.

Back-surface progressive + Back-surface Aspheric design

Back-surface progressive + Back-surface Aspheric design

Indoor LD provides a wider field of vision and comfortable fit to customers needing all kinds of power with no difference in optical performance caused by power.

<Flexible Inset Adjustment>
for a wide near-distance field of vision that factors in line of vision movement

51 options for inset of near zone are available in 0.1 mm steps

<Curve Pairing system>
for attractive pair lens appearance and outstanding optical performance

Significant differences in the powers of the right and left lenses produce differences in the base curves, adversely affecting appearance.
In cases where there is a significant difference between the base curves, the curves of Indoor LD are automatically matched to adjust the appearance at the same time as realizing outstanding optical performance.

When curves are matched

<Flexible Prism Thinning>for optimum pair lens thickness

Flexible Prism Thinning is carried out to achieve greater thinness and lightness of edged lenses to frame shapes.
The prism volume of Indoor LD is set by each additional power with the balance between appearance and optical performance. The prismatic volume of the left and right lenses are automatically matched.
In this case, the prismatic volume is matched to the smaller value.

Flexible Prism Thinning effect

<Advanced Aspheric Design>There is a reduction of blur caused by astigmatism

Advanced Aspheric Design

Clearer astigmatic field of vision.
Optimum aspheric correction is achieved using elements such as power, close work distance, base curve and the lens tilt angle in line with "Listing's Law" that determines the orientation of the eyeball when the field of vision shifts in upward, downward, left, right and diagonal directions.
Astigmatic field of vision wider by approximately 25%*

Listing's Law

Lens appearance

Thin, lightweight and comfortable to wear

  • Previous lens
  • 1.60 lens
  • 1.67 lens

This is an image of S-6.00. SEIKO's previous lens used 1.50 monomer.

The numerical value that indicates the ability of the lens material to refract light is called the "refractive index" and the higher this index, the thinner the lens. Indoor LD features a lineup of 2 types of material: Ultra-high 1.74 refractive index material and 1.60 material. In addition, back surface aspheric design is used to achieve a thin lens. The synergy between material and design enables a lens that is thinner and lighter than previous lenses.

Adopted technologies

  • Back-surface progressive + Back-surface Aspheric design
  • Super Resistant Coat BR
  • Super Resistant Coat
  • Super Durable Coat
  • Super Clean Coat BR
  • UV Protect Plus

Thinness / coating

Product Name Thinness UV Cut off Reflection Resistance Contamination Resistance Scratch Resistance Anti-static Resistance Reducing blue light Blocking UV rays reflected from the back Fogging Resistance
Indoor LD 1.67 ★★★★ 標準 標準 標準 OP OP OP OP OP
Indoor LD 1.60 ★★★ 標準 標準 標準 OP OP OP OP OP

S:Standard specifications OP:Option

Specifications

Product Name Refractive Index Specific Gravity Abbe Value Progressive Power Corridor (mm) Quality Assurance Mark
Indoor LD 1.67 1.67 1.36 32 23
Indoor LD 1.60 1.60 1.30 42 23